This is a high-performance replacement cordless battery for the OOMA HB1001, guaranteed to meet or exceed the OEM specifications of your original. The cordless battery is 1.75 x 1.2 x 0.42 inches with an output of 3.6 volts. The chemistry is NIMH at 700mAH capacity. Manufactured by Empire Scientific, model number CPH-464Z. We offer a 1 Year Warranty with purchase. See this product elsewhere at a lower price? Call or email us; we have a Price Match Guarantee.